解决一个BUG, 当导出大字体时或者是将导出窗体切换到后台时导出点阵为空白或者只导出局部, 已解决些BUG, 办法是将导出界面设置为系统模态窗体, 将输入自定字符的窗体在导出字符点阵前关闭, 避免挡住字符点阵图-Solve a BUG, when large fonts when exporting or export the form to switch to the background lattice Export Export blank or only partially, have